Shortcode aims to allow for more dynamic use of content by authors and editors, allowing for injection of reusable bits of content or even whole pieces of functionality into any field in EE. Shortcode provides two types of codes for use in any content in EE: user-defined Macros specific to each author and each site, as well as a simple API for third-party plugins and modules to expose their tags through the shortcode Rich Text Editor dialog (or manual entry in any type of field) - complete with automatically rendered options forms.

Super Globals has been discontinued. Low Variables has far surpassed Super Globals in functionality (though I was never trying to directly compete). I had an itch and Super Globals scratched it for awhile, but lately sales have been low and I myself prefer Low Variables over Super Globals.
If you're looking for the {get:x} and {post:x} functionality I suggest that you try Mo' Variables, it does the same thing and its free.

Super Globals has been discontinued. Low Variables has far surpassed Super Globals in functionality (though I was never trying to directly compete). I had an itch and Super Globals scratched it for awhile, but lately sales have been low and I myself prefer Low Variables over Super Globals.
If you're looking for the {get:x} and {post:x} functionality I suggest that you try Mo' Variables, it does the same thing and its free.